/*
 * Copyright (c) 2023 dzikoysk
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.reposilite.status

import java.util.concurrent.ScheduledExecutorService
import java.util.concurrent.ScheduledFuture
import java.util.concurrent.TimeUnit
import java.util.concurrent.TimeUnit.HOURS
import java.util.concurrent.TimeUnit.MINUTES

internal class StatusSnapshotScheduler(private val scheduler: ScheduledExecutorService, private val statusFacade: StatusFacade) {

    private var currentTask: ScheduledFuture<*>? = null

    fun start() {
        scheduleStatusSnapshot(MINUTES)
    }

    private fun scheduleStatusSnapshot(timeUnit: TimeUnit) {
        currentTask = scheduler.schedule({
            statusFacade.recordStatusSnapshot()

            when {
                statusFacade.getLatestStatusSnapshots().size >= 12 -> scheduleStatusSnapshot(HOURS)
                else -> scheduleStatusSnapshot(MINUTES)
            }
        }, 1, timeUnit)
    }

    fun stop() {
        runCatching {
            currentTask?.cancel(true)
        }
    }

}